Does Pre-cum Contain Sperm? Understanding the Science

Question
Sometimes after foreplay my boyfriend penetrates "in and out" a few times before he puts the condom on. I have researched online and its been said that new researches show "there is no sperm in pre-cum only if he masturbates beforehand". Is this true? what have you heard...Sometimes after foreplay my boyfriend penetrates "in and out" a few times before he puts the condom on.
I have researched online and its been said that new researches show "there is no sperm in pre-cum only if he masturbates beforehand". Is this true? what have you heard on this theory?/

I honestly don't want the pill in my system until I am married and having steady sex. Right now we only engaged once in a while due to things.
I honestly don't want the pill in my system until I am married and having steady sex. Right now we only engaged once in a while due to things.  

Answer
There are approximately 300,000 sperm at the tip of the penis prior to ejaculation (pre-cum). If your boyfriend inserts his penis into your vagina and tries to withdraw before ejaculation, these sperm can be "milked" into your vagina and you can become pregnant if it is at the right time of the month. There is no new research laiming that there is no sperm in the pre-ejaculate. That is rubbish and you should avoid that website. If you have a normal 28 day cycle (from the first day of your period until the first day of your next period) ovulation occurs on cycle day #14. You can only become pregnant if you have unprotected sex on cycle day #13, 14, 15, or 16 unless you have a cycle that is longer or shorter than 28 days. If you do become pregnant on one of those days, a pregnancy test will not show a positive result until 14-21 days later. The best time to take a pregnancy test is seven days after missing your period. (In a full ejaculate, there are more than 3 million sperm). I would suggest birth control pills if you are going to continue to fool around as you have been doing. Birth control pills are healthy for you. They prevent iron deficienty anemia, ovarian cysts, cancer of the uterus, cancer of the ovaries, regulate your period, get rid of the pain of your period (dysmenorrhea), get rid of acne, and prevent pregnancy  99.9% of the time. As long as you do not smoke, the only side effects are some breakthrough bleeding, nausea, and headache during the first three months of pill use. Pills are the best type of birth control around. Good Luck to you.